Rolling contact member and rolling bearing

a contact member and roller technology, applied in the direction of roller bearings, mechanical devices, transportation and packaging, etc., can solve the problems of insufficient lubricity, insufficient lubricity, and difficulty in rolling bearing maintenance, so as to ensure sufficient durability. , the effect of reliable guaran

Inactive Publication Date: 2013-02-12
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0043]As apparent from the above description, according to the rolling contact member and the rolling bearing of the present invention, there can be provided a rolling contact member formed of a β-sialon sintered body inexpensive, capable of reliably ensuring sufficient durability, and capable of being used in an application where an imposed load is changed abruptly, as well as a rolling bearing including such a rolling contact member.

Problems solved by technology

Furthermore, a hub unit, which is a type of rolling bearing, is often used in an environment having a possibility of receiving moisture therein and hence having insufficient lubricity.
As a result, lubricity is likely to be insufficient.
Further, the rolling bearings for a wind turbine generator are occasionally installed in locations in which it is difficult to do maintenance of the rolling bearings.
Furthermore, wind turbine generators, which are usually installed at a high altitude, may be struck by lightning, which may cause current to flow in the inner portion of a rolling bearing for a wind turbine generator.
This may result in generation of electrolytic corrosion.
The electrolytic corrosion causes damage on a raceway surface of the race member or the rolling element, resulting in decreased life of the rolling bearing for a wind turbine generator.
However, silicon nitride, sialon and similar ceramics require higher production cost than steel, and adopting ceramics as a material for components of rolling contact members of rolling bearings disadvantageously increases their production costs.

Method used

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  • Rolling contact member and rolling bearing
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  • Rolling contact member and rolling bearing

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0063]Initially reference will be made to FIG. 1 and FIG. 2 to describe a deep-grooved ball bearing implementing a rolling bearing in a first embodiment.

[0064]With reference to FIG. 1, a deep-grooved ball bearing 1 includes a race member implemented as an annular outer ring 11, a race member implemented as an annular inner ring 12 arranged to be inner than outer ring 11, and rolling elements implemented as a plurality of balls 13 arranged between outer and inner rings 11 and 12 and held in an annular cage 14. Outer ring 11 has an inner circumferential surface having an outer ring raceway surface 11A and inner ring 12 has an outer circumferential surface having an inner ring raceway surface 12A. Outer ring 11 and inner ring 12 are disposed such that inner ring raceway surface 12A and outer ring raceway surface 11A face each other. The plurality of balls 13 have rolling contact surfaces 13A in contact with inner ring raceway surface 12A and outer ring raceway surface 11A, and are disp...

second embodiment

[0082]With reference to FIGS. 8 and 9, a second embodiment provides a hub unit, as will be described hereinafter.

[0083]With reference to FIG. 8 and FIG. 9, a hub unit 3 is basically similar in configuration and effect to deep-grooved ball bearing 1 described with reference to FIG. 1, except that the former includes a race member and a rolling element different in configuration than the latter. More specifically, hub unit 3 is a device posed between a vehicular wheel and a vehicular body and rotatably supporting the wheel relative to the body. Hub unit 3 includes a race member implemented as an outer ring 31, a hub ring 32 and an inner ring 33, and a rolling element implemented as a plurality of balls 34.

[0084]Outer ring 31, serving as an outer member, is an annular race member having an inner circumferential surface provided with two rows of raceway surfaces 31A1, 31A2.

[0085]Hub ring 32, serving as an inner member, is a race member having a raceway surface 32A opposite to one racewa...

third embodiment

[0090]Referring to FIG. 10, a configuration of a wind turbine generator including a rolling bearing for a wind turbine generator in a third embodiment will be described.

[0091]Referring to FIG. 10, wind turbine generator 150 includes a blade 152 that is a rotating blade; a main shaft 151 having one end connected to blade 152 so as to include the central axis of blade 152; and a step-up gear box 154 connected to the other end of main shaft 151. Further, step-up gear box 154 includes an output shaft 155. Output shaft 155 is connected to a power generator 156. Main shaft 151 is supported by main shaft bearings 101, each of which is a rolling bearing for a wind turbine generator, so as to be rotatable around the axis. Further, the plurality of main shaft bearings 101 (two in FIG. 10) are arranged side by side in the axial direction of main shaft 151, and are held by housings 153 respectively. Main shaft bearings 101, housing 153, step-up gear box 154, and power generator 156 are containe...

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Abstract

Each of an outer ring, an inner ring, and a ball is a rolling contact member formed of a β-sialon sintered body inexpensive, capable of reliably ensuring sufficient durability, and capable of being used in an application where an imposed load is changed abruptly. The sintered body contains as a main component β-sialon represented by a compositional formula of Si6-ZAlZOZN8-Z and satisfying 0.1≦z≦3.5, and has a remainder formed of an impurity. The rolling contact member has a Young's modulus of 180 GPa or greater but 270 GPa or smaller.

Description

RELATED APPLICATIONS[0001]This application is the U.S. National Phase under 35 U.S.C. §371 of International Application No. PCT / JP2008 / 068771, filed on Oct. 16, 2008, which in turn claims the benefit of Japanese Application Nos. 2007-271232, filed on Oct. 18, 2007 and 2007-286502, filed on Nov. 2, 2007, the disclosures of which applications are incorporated by reference herein.TECHNICAL FIELD[0002]The present invention relates to a rolling contact member and a rolling bearing, more particularly, a rolling contact member formed of a sintered body containing β-sialon as a main component and a rolling bearing including the rolling contact member.BACKGROUND ART[0003]Silicon nitride, sialon and similar ceramics characteristically not only have a smaller specific gravity and are more corrosive-resistant than steel but are also insulating. Accordingly, if ceramics are adopted as a material for a rolling contact member that is a component of rolling bearings (including hub units) each inclu...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): F16C33/62
CPCC04B35/597F16C33/32F16C33/34F16C33/62C04B35/6455F16C2206/60C04B2235/3217C04B2235/3225C04B2235/3869C04B2235/767C04B2235/94C04B2235/96F16C2326/02F16C2380/26F16C2360/31F16C2361/61F16C23/086F16C2220/20F16C19/38
InventorMURAMATSU, KATSUTOSHIHONDA, MASAAKIISHIDA, HIKARUNINOYU, NOBUYUKI
OwnerNTN CORP